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Electrostatic potentials were calculated by APBS 'on-the-fly' in PyMOL (via the "APBS Tools" wizard) and then displayed (via the
"Electrostatics" wizard) for this small protein (<50-aa residues). The bounding box used by the PBE solver is shown,
and the electrostatic potential is mapped onto a transparent VdW molecular surface of the same peptide:

Same potentials as above displayed as isopotential surfaces contoured at levels of +2 kT/e (blue) and -2 kT/e (red):